Mechanism for converting reciprocating motion into rotary motion



March 22, 1932. E. R. BOOTH MECHANISM FOR CONVERTING RECIPROCATING MOTION INTO ROTARY MOTION Filed Sept. 1, 1931 2 Sheets-Sheet 1 .9 FiGQl.

EMMOMS E. B007?! INVENTOR.

ATTORNEY.

March 22, 1932. E. R.'BOOTH 1,850,070

MECHANISM FOR CONVERTING RECIPROCATING MOTION INTO ROTARY MOTION Filed Sept. 1, 1931 2 Sheets-Sheet 2 F16. F116. 6. -9 a i 30 EMMONS R5007 INVENTOR.

ATTORNEY.

' ,5 The principal"; object of'i'this invention is ing the sliding keya right angles to the. rack Patented Mar. 22, 1932 I a EMM ONS R." BOOTH, F CINCINNATI, OHIO f UNI TED MECH NISM roncoivvnnmnve. niiclrnocn'rms MOTION nvrro 302mm! uo'rrqz q Applicatig'n' filed fiepten ber 1931.- s eri iuo. 560,541; a

This invention relates. to certain new" and or'rack gear and a portionof the rack with useful improvements in mechanisn for con the sliding key'in a position parallel with'said erting reciprocating motion-into rotary naorack; I i 7 tion.- i Fig; is avi'ew similar to Fig. 4' but showa vto providemeans for Converting reciprocatorat the changing point of the key;

ing motion of a rack to the rotaryi motion of Fig} 6 is anfisometric vdetail View of the a shaft, and consists in the combinationof j sliding key; I three bevel gears heldin permanent mesh I Fig. 7 is an isometric detail view (mostly with each. other, one 1 of said gears "being s'hwn by broken lines) of one ofthelarjge fixed to a driven, shaft and'fthe iother bevel gears; 1 two 7 gears keyed v to "short shafts; 1 also ,7 F ig, 8 is an isometric view (mostly'shown v a gear mounted on the inner end's fof inphantom or brhke'} lines) 'ofth'e central said short shafts, respectively, and in peror rack gear; I i 15 manent mesh with teeth ona' rack; also in a ig, 9 is an isometric detail View showing '65 sliding key carried by said last-mentioned a 'lhodifi c'ation of the sliding key, gear and adapted to lock" with one of said I Fig, 10 is a detailview'iofthe supporting short shafts on the forward stroke said, shaft'for theshort shafts 9 and l Og and rack and with the otherqof said short shafts Fig; 11 is a'fragnientary' end and plan; 20, on the return stroke of said rack. view of the rack to more clearly "show' one of Otherobjects and advantages will he, evi'-. the yielding'rack teeth. I dent upon afull understandingof. the nature I In theem'bodimentof my invention asillus- V of the sliding key,the invention ilesidingsuhtrated and which shows a preferred construcstantially in the novel vfeatures of construc- I provide'a mechanism for converting tion, arrangement andcombination of parts reciprocating, motion" into rotary motion, constituting the device, j which'mechanismiis suitably mounted I A preferred form of the invention set housing'or case 1, said case being preferably I forth in the accompanying drawings and fo lhiadef'in two parts,such as the botto nor lowlowing description, butIit to he understoodl oer half2 andthe top or upper half 3. As that such embodiment is; presented merely shown in ig. 2",, these halves 2 and'3' of the for the purpose of illustration and is not to case 1 areheld'together by holtsf l threaded i be accorded any interpretation which vmight in the bosses :5 formed integral vvithithe hotbe calculated to limit the invention short ,of I tom 2. Gears 6,7 and "8' are bevel gears", all

its true and most comprehensive scope in of which are inconstant meshingengagev the art. a 1nent,1 a sishovvn in F igl 1, the gears 6 and 8 In the drawings: a y

z 7 Y being largerrthan gear and fixed tofshort" Fig. 1 is a plan view (partly brokenaiway) shafts T9 and 1'0, respectively, by ys;11 11, of the invention shown; installed in a metal or can he made as an integral part of said I case or housing withthe upper half or top of gears, as shown Fig". 3; Theseshaitfs" 9 the case removed to more clea novel features of the device; 7

i r I '12% l2fiXed-,topads I31,(foiimed with" Fig.2 is a sideelevation o f Figy 1, "thezpase thelower halt-or bottom 5210f easel) by its or housing being sfhownin central vertical Gear 7" is.secured .toithe inner' en [of 45 section; I I I v.drlvenshaf t lEhyakey 15, or equ al nt. a Fig. 3 is a central horizontalzsectionzofthe means, and said shait 1s rotatahly four-baled rly i1l ustrate the I and lO 'are' rotatabl'y' inounted i n bearings; 99

gears shown in Fig l to'clearly illustrate the in bearings 16 and" as clearly s'hownflinl d ng y a 901 116960 it wesh r F Bear n 11 i aPPOTt y We'l shafts; r p i I formed integral withthelowerthalf ofIthe Fig. 4 is a fragmentary si'degelevation case 1 and fined to sa dwallbvfbolts'lfiias sh wnrart b wh elies)p th anfir sh ws G a i r r d r fih ir c bore 21 to receive the inner end of each shaft 9 and 10 (as best seen in Fig. 1) and teeth 22 cut on its outer periphery are adapted to re ceive and mesh with the teeth 23 cut on the underside of rack 24, as clearly shown in Fig. 2. The rack 24 is reciprocably mounted in bearings 2525 formed integral with the upper half or top 3 of case'l. For assembling purposes the rod portion 24a of the rack is made as a separate part from the square portion.

Referring next to the sliding key, which is designated by the numeral 26 and shown in detail in Fig. 6, it will be noticed that said key is double-ended and substantially flat. This key is received within the slotted openings 27 and 28 in central or rack gear 20 (see Fig. 3) and its overall length is shorter than the outer diameter of gear 20 by the height of the teeth 22. Part 29 of key 26 slidably fits within the slot 27 of gear 20 and part 30 of said key slidably fits within the slot 28 of gear 20. Shafts 9 and 10 are provided with keyreceiving slots 31 and 32, respectively, to alternately receive the inner edges 33 and 34 of sliding key 26. i

Operatt'om-The operation of my improved mechanism for converting reciprocating n10- tion into rotary motion is as follows:

Assuming that the rack 24 is reciprocated within the bearings 25 of the upper half or top 3 of case 1, and for explanatory purposes we will assume that the rack 24 is about to be driven in the direction'of arrow A, Figs. 1 and 2. This being true, the teeth 28 of said rack 24, meshing with the teeth 22of the rack gear 20 will cause said gear 20 to be rotated one-half of a revolution in a clockwise dire ckey receiving slot 31 in shaft 9 and forcing the inner edge 33jinto the key receiving slottion, asviewed in Fig.2, and as'the inner edge 34 of key 26 is in engagement with the key receiving slot 31in shaft 9, said shaft 9 will be rotated in a clockwise direction and as the beveled gear6 is fixed or keyed to said shaft, it likewise will be rotated in a clockwise direction which, in turn, rotates the bevel gear 7 and the driven shaft 15; As the bevel gear 8 is in permanent mesh with the gear 7,

w it will likewise be rotated, but due to the fact that the edge 33 of the sliding key 26 is out of engagement with the key receiving slot 32 in the shaft 10, said gear 8 acts as an idler until the sliding key 26 assumes "a vertical position, as shown in Fig. 5, at which time the yielding or springpressed tooth 23a of the rack24 forces said key downwardly, thereby removing the inner edge 34 thereof from the 32 in shaft 10. The purpose of the springpressed or yielding teeth 23a, of which there are two within the rack 24, is that a quicker action is imparted to theslidingkey at the change point.

From the foregoing description, taken in connection with the accompanying drawings,

it will be readily apparent that on the forward stroke or stroke A of the rack 24, gear 20 is driven in a clockwise direction and the sliding key 26, being in engagement with shaft 9, drives bevel gear 6 in a clockwise direction, which, in turn, drives bevel gear 7 and shaft 15. On the return stroke of rack 24, gear 20 is disconnected from short shaft 9 by movement of the sliding key 26 and said gear 20 is then connected to the short shaft 10, the drive or power derived from the rack 24 to'the drivenshaft 15 being through gear 20, sliding key 26, short shaft 10, bevel gea '8 and bevel gear 7 By an examination of Fig. 1, it will be noticedthat the central 01' rack gear 20 is freely mounted upon the inner ends of shafts key 26. Due to this movement of the sliding key 26, the central or rack gear 20 is turned in a clockwise direction during one motion of the rack and in an anti-clockwise direction during the return motion of said rack.

From the foregoing explanation, it will, therefore, be seen that the reciprocating motion of rack 24 imparts a constant rotary motion to the driven shaft 15, due to the sliding key 26, which makes the gear 6 the driver.

and gear San idl'er'and vice versa.

. "WhileI have shown and described one particular embodiment of my invention it will be understood that various changes and modiiications can be made without departing from the scope or spirit thereof as, for example, the short shafts 9 and lO'can be provided with a central hole, designated 35 in Fig. 7, to receive a'supporting rod 36, as shown in Fig. 10,

ito -further strengthen said shafts, in which case the central portion of the sliding key 26 would be slightly modified, as shown in Fig. '9, to provide the oblong opening 37 to receive the supporting rod 36 above referred to.

Y WVhat I claim as new and desire to secure by Letters'Patent is:

1. Mechanism for converting reciprocating IIlOtlOIllIltO rotary motlon comprising the combination of a driven element in the form of a rack, a pair of bevel gears, a pinion in permanent mesh with said bevel gears, an intermediate gear, the teethof which are in constant mesh with the teeth of said rack, dr vlng shaft fixed to said pinion, 'a short shaft for each of said bevel gears, and a sliding key carried by said intermediate gear and adapted to alternately connect said intermediate gear with'said bevel gears, respectively, whereby the reciprocating motion of said rack drives said pinion and attached shaft in a constantrotary motion.

2'. Mechanism} for convertlng reciprocating motion into'rotary motion comprising the combination of a reciprocating driving'rack, a rack gear having a keyway, the teeth of. which are adapted to be 'in constant mesh with the teeth on said rack, a sliding key received within said keyway, a pair of bevel gears disposed on opposite sides of said rack gear, a pinion held in permanent mesh with said bevel gears, a driven shaftfixed to said pinion, and each short shaft having atthe inner end thereof, whereby 011 the forward stroke of said rack said sliding key looks with and drives one of said short shafts and its attached bevel gear and'whereby on the return stroke of said rack said sliding key locks with and drives the. other of said short shafts and its attached bevel gear to thereby transmit a constant rotary motion to said pinion and driven shaft from the reciprocatingmotion of said rack.

3. Mechanism for converting reciprocating motion into rotary motion comprising the combination of a two part case, a driving rack reciprocably mountedtherei-n and having driving teeth on, the underside thereof, a pair of bevel gears, a shaft for each bevel gear havinga keyway and rotatably .mountedwithin said case, a pinion in permanent mesh with said bevel gears, a driven shaft rotatably mounted in said case and fixed to said pinion, a rack gear freely mounted on the inner end of said bevel gear shafts,

and a key slidably mounted within said rack gear whereby during the forward motion .of saiderack said rack gear rdrives one of said bevel gear shafts through said key and whereby on the return stroke of said rack said rack gear will drive the other of said bevel gear shafts to thus convert the reciprocating motion of said rack into a constant rotary m0- which are in constant mesh with the teeth of said rack, a driving shaft fixed to said pinion, a short shaft for each ofsaid bevel gears and a sliding key carried by said intermediate gear andadapted to alternately connect said intermediate gear with said bevel gears, respectively, whereby the reciprocating motion of said rack drives said pinion and at, tached shaft in a constant rotary motion.

EMMONS R. BOOTI-L.

. tion of said driven shaft, substantially as de- 7 scribed.

4. Mechanism for converting reciprocat ing motion into rotary motion comprising the combination of a driving rack, a pair of bevel gears, a p1n1on 1n permanent mesh with said beveled gears, an intermediate gear in constant mesh with said rack, a driven shaft fixed to said pinion, a short shaft for each of said bevel gears, a'central bore in each short shaft, a supporting shaft inserted with-'- "ing motion into rotarymotion comprising the combination of a'driven element in the form of a rack, two of the teeth of which are yieldably mounted, a pair of bevel gears, a r

pinion in permanent mesh with said bevel gears, an intermediate gear, the teeth of 

